# The Free Answer — All Questions

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• ## Liquid propane is commonly used as a fuel for heating homes, powering vehicles such as forklifts, and filling portable picnic tanks. Consider a propane tank that initially contains 5 L of liquid propane at the environment temperature of 20°C. If a hole develops in the connecting tube of a propane tank and the propane starts to leak out, determine the temperature of propane when the pressure in the tank drops to 1 atm. Also, determine the total amount of heat transfer from the environment to the tank to vaporize the entire propane in the tank.

Liquid propane is commonly used as a fuel for heating homes, powering vehicles such as forklifts, and filling portable picnic …

• 3 views
• ## Reconsider Prob. 3–129. Using EES (or other) S9 software, investigate the effect of the initial pressure of refrigerant-134a on the volume of the tank. Let the initial pressure vary from 0.5 to 1.5 MPa. Plot the volume of the tank versus the initial pressure, and discuss the results.

Reconsider Prob. 3–129. Using EES (or other) S9 software, investigate the effect of the initial pressure of refrigerant-134a on the …

• 3 views
• ## A tank whose volume is unknown is divided into two parts by a partition. One side of the tank contains 0.03 m3 of refrigerant-134a that is a saturated liquid at 1.2 MPa, while the other side is evacuated. The partition is now removed, and the refrigerant fills the entire tank. If the final state of the refrigerant is 30°C and 400 kPa, determine the volume of the tank.

A tank whose volume is unknown is divided into two parts by a partition. One side of the tank contains …

• 8 views
• ## Steam at 400°C has a specific volume of 0.02 m3/kg. Determine the pressure of the steam based on (a) the ideal-gas equation, (b) the generalized compressibility chart, and (c) the steam tables.

Steam at 400°C has a specific volume of 0.02 m3/kg. Determine the pressure of the steam based on (a) the …

• 7 views
• ## The gage pressure of an automobile tire is measured to be 200 kPa before a trip and 220 kPa after the trip at a location where the atmospheric pressure is 90 kPa. Assuming the volume of the tire remains constant at 0.035 m3, determine the percent increase in the absolute temperature of the air in the tire.

The gage pressure of an automobile tire is measured to be 200 kPa before a trip and 220 kPa after …

• 8 views
• ## A 4-L rigid tank contains 2 kg of saturated liquid–vapor mixture of water at 50°C. The water is now slowly heated until it exists in a single phase. At the final state, will the water be in the liquid phase or the vapor phase? What would your answer be if the volume of the tank were 400 L instead of 4 L?

A 4-L rigid tank contains 2 kg of saturated liquid–vapor mixture of water at 50°C. The water is now slowly …

• 6 views
• ## A 20-m3 tank contains nitrogen at 23°C and 600 kPa. Some nitrogen is allowed to escape until the pressure in the tank drops to 400 kPa. If the temperature at this pdint is 20°C, determine the amount of nitrogen that has escaped.

A 20-m3 tank contains nitrogen at 23°C and 600 kPa. Some nitrogen is allowed to escape until the pressure in …

• 7 views
• ## Ethane at 10 MPa and 100°C is heated at constant pressure until its volume has increased by 60 percent. Determine the final temperature using (a) the ideal gas equation of state and (b) the compressibility factor. Which of these two results is the more accurate?

Ethane at 10 MPa and 100°C is heated at constant pressure until its volume has increased by 60 percent. Determine …

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• ## One pound-mass of water fills a 2.649 ft3 weighted piston-cylinder device at a temperature of 400°F. The piston-cylinder device is now cooled until its temperature is 100°F. Determine the final pressure and volume of the water.

One pound-mass of water fills a 2.649 ft3 weighted piston-cylinder device at a temperature of 400°F. The piston-cylinder device is …